Grok 4.7 vs GPT-5.6 Sol: Brainstorming Receipts

01 / Price the Brainstorm, Not the Model’s Reputation

A brainstorming session should end with usable ideas and an explainable bill. For Grok 4.7 versus GPT-5.6 Sol, separate two questions: what does an equivalent token budget cost, and which response produces more ideas worth keeping?

The receipts below are calculated examples, not measured model runs or creativity benchmarks. They use published direct-provider rates checked on October 25, 2026, not verified CheapRelay selling prices. Check your actual route’s rates before treating any estimate as a spending commitment.

02 / The Rate Card Behind These Receipts

• ■ Grok 4.7: $2 per million uncached input tokens and $6 per million output tokens. Published cached-input pricing is $0.50 per million tokens. ([docs.x.ai](https://docs.x.ai/developers/models/grok-4.7))
• ■ GPT-5.6 Sol: $4 per million uncached input tokens and $20 per million output tokens. Published cached-input pricing is $0.40 per million tokens. Its documentation says promotional pricing is available at least through November 21, 2026. ([developers.openai.com](https://developers.openai.com/api/docs/models/gpt-5.6-sol?utm_source=openai))

Our example assumes short text requests, uncached input, no tools, and 3,000 total billable output tokens. That output allowance must cover any billed reasoning, not just the ideas visible in the response. Actual usage may exceed the estimate.

03 / Receipt: One Three-Round Brainstorming Session

Imagine developing launch concepts for a small budgeting app. Round one requests 20 distinct angles. Round two challenges the strongest candidates. Round three turns five finalists into short campaign briefs.

Budget 1,200 input tokens for the first round, 2,000 for the second, and 2,800 for the third. Those allowances include instructions and any conversation history resent. Across all rounds, allocate 3,000 billable output tokens.

• ■ Grok 4.7 input: 6,000 ÷ 1,000,000 × $2 = $0.012.
• ■ Grok 4.7 output: 3,000 ÷ 1,000,000 × $6 = $0.018.
• ■ Grok 4.7 session total: $0.030, or 3 cents. ([docs.x.ai](https://docs.x.ai/developers/models/grok-4.7))
• ■ GPT-5.6 Sol input: 6,000 ÷ 1,000,000 × $4 = $0.024.
• ■ GPT-5.6 Sol output: 3,000 ÷ 1,000,000 × $20 = $0.060.
• ■ GPT-5.6 Sol session total: $0.084, or 8.4 cents. ([developers.openai.com](https://developers.openai.com/api/docs/models/gpt-5.6-sol?utm_source=openai))

The calculated difference is 5.4 cents per session. That is a token-budget comparison, not evidence that either model produces better concepts.

04 / Receipt: 100 Sessions and the Retry Trap

Repeat that exact budget 100 times and the calculated totals become $3.00 for Grok 4.7 and $8.40 for GPT-5.6 Sol. These projections apply the published rates above without assuming cache savings or additional charges. ([docs.x.ai](https://docs.x.ai/developers/models/grok-4.7))

Now test a hypothetical failure case: Grok needs three complete attempts to reach an acceptable shortlist, while GPT needs one. The respective totals become $0.090 and $0.084. The lower-priced token route no longer produces the cheaper completed task. This is a sensitivity example, not an observed difference between the models.

05 / Judge the Ideas Before Choosing the Cheaper Receipt

Run a small blind comparison using identical briefs and comparable spending limits. Remove model labels before reviewing. Define an acceptable idea as distinct, relevant to the audience, feasible within budget, and specific enough to test.

• ■ Count accepted ideas after removing duplicates.
• ■ Record actual billed tokens and total spending.
• ■ Include retries rather than reporting only successful calls.
• ■ Divide total spending by accepted ideas.

Also track editing time. At an assumed labor cost of $30 per hour, one minute of review costs $0.50. That makes a small improvement in usability potentially more valuable than the 5.4-cent difference in this example.

06 / Use CheapRelay Without Assuming an Unverified Discount

CheapRelay offers pay-as-you-go access through one key, with no monthly fee or subscription. Billing follows real token usage, including cache reads and writes. Use the actual model-route prices to rebuild these receipts; do not substitute provider rates for your relay invoice.

Sign up for CheapRelay to compare Grok 4.7 and GPT-5.6 Sol on your own brainstorming briefs. Start with a capped experiment, keep the receipts, and choose the lowest cost per usable idea—not simply the lowest price per million tokens.